WO2008018211A1 - Magnetic sheet, antenna device, and method for manufacturing antenna device - Google Patents

Magnetic sheet, antenna device, and method for manufacturing antenna device Download PDF

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Publication number
WO2008018211A1
WO2008018211A1 PCT/JP2007/058232 JP2007058232W WO2008018211A1 WO 2008018211 A1 WO2008018211 A1 WO 2008018211A1 JP 2007058232 W JP2007058232 W JP 2007058232W WO 2008018211 A1 WO2008018211 A1 WO 2008018211A1
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WO
WIPO (PCT)
Prior art keywords
ferrite sintered
antenna
magnetic sheet
sintered body
antenna device
Prior art date
Application number
PCT/JP2007/058232
Other languages
French (fr)
Japanese (ja)
Inventor
Keisuke Aramaki
Satoru Sugita
Yoshito Ikeda
Takeshi Nakazawa
Original Assignee
Sony Chemical & Information Device Corporation
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sony Chemical & Information Device Corporation filed Critical Sony Chemical & Information Device Corporation
Publication of WO2008018211A1 publication Critical patent/WO2008018211A1/en

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q7/00—Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop
    • H01Q7/06—Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop with core of ferromagnetic material
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q7/00—Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop
    • H01Q7/06—Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop with core of ferromagnetic material
    • H01Q7/08—Ferrite rod or like elongated core

Definitions

  • the present invention relates to a magnetic sheet suitable for use in IC cards, IC tags, and the like, an antenna device, and a method for manufacturing the antenna device.
  • This RFID system is a small non-contact integrated circuit (hereinafter referred to as an IC) device that stores various data called a transbonder so that it can be read and Z or writable, and has a communication function.
  • This is a technology that performs data reading and Z or writing without contact with the transponder by performing wireless communication with the Z writer.
  • This RFID system configures a transponder as an IC tag and attaches the IC tag to a product to perform production and logistics management.
  • the transponder is configured as an IC card to collect charges for transportation. It is expected to be used for various purposes such as ID cards, and even electronic money.
  • an IC card or an IC tag an IC card in which information is stored and a resonance capacitor are electrically connected to an antenna coil is known. These are the transmission / reception antenna power of the reader / writer. By transmitting radio waves of a predetermined frequency to the antenna coil, the information stored in the IC chip can be read, or whether the power can resonate with radio waves of a specific frequency. It is configured to be identified or monitored by In addition to this, many IC cards and IC tags are configured to be able to update information stored in the IC chip and write history information.
  • an antenna module in which a soft magnetic material is inserted so as to be substantially parallel to the plane of the antenna coil with respect to the antenna coil wound in a plane.
  • soft magnetic material made of amorphous sheet or electromagnetic steel plate is By inserting the antenna module so as to be substantially parallel to the plane of the tenor coil, the antenna module as a whole is made thinner.
  • the soft magnetic material is also an amorphous sheet or an electromagnetic steel plate
  • the force that can be used when the carrier frequency is about 100 kHz is obtained.
  • the frequency becomes as high as several tens of MHz an eddy current is generated in the amorphous sheet or electromagnetic steel sheet, which is a soft magnetic material, and the Q value is lowered. Therefore, this antenna module cannot be applied to IC cards and IC tags using RFID technology that operates at a carrier frequency of 13.56 MHz.
  • a ferrite sintered body is conventionally known as a soft magnetic material that can cope with a high frequency.
  • the ferrite sintered body is a brittle material, if it is formed thin in order to meet the recent demand for thinner IC cards and IC tags, it becomes brittle and has impact resistance. There is a problem that it is extremely low. Therefore, by forming a soft magnetic material with a composite material of soft magnetic metal, amorphous powder or ferrite powder or flakes and plastic or rubber, the rigidity is higher than when using a fragile ferrite sintered body. and relatively high ⁇ frequency Nio, antenna coils adapted to be used has been proposed (e.g., see Patent Document 2, etc..) 0
  • Patent Document 3 is configured by laminating an antenna coil wound in a spiral shape in a plane and a ferrite sintered body disposed so as to be substantially parallel to the plane of the antenna coil.
  • An antenna module is disclosed.
  • the antenna coil described in Patent Document 2 may be incorporated into various communication devices. Therefore, if there is a metal object in the vicinity even if it is not an article to be identified, the effect is affected. It becomes easy to receive.
  • a technology has been proposed in which a metal shield plate is attached to the back surface (attached surface) of the communication surface to suppress fluctuations in communication characteristics due to metal objects.
  • fluctuations in the communication characteristics of the antenna coil are suppressed by the shield plate. Conversely, this means that the communication characteristics of the antenna coil are lowered to a certain level by the shield plate. It also becomes.
  • Patent Document 1 Japanese Patent Application Laid-Open No. 2000-48152
  • Patent Document 2 Japanese Patent Laid-Open No. 2002-325013
  • Patent Document 3 Japanese Unexamined Patent Publication No. 2000-113142
  • the present invention has been made in view of such circumstances, and can achieve high rigidity while using a ferrite sintered body that is a brittle material, and realize excellent communication characteristics.
  • An object of the present invention is to provide a magnetic sheet that can be used, an antenna device, and a method for manufacturing the antenna device.
  • the magnetic sheet according to the present invention that achieves the above-mentioned object is formed by spreading a plurality of flat ferrite sintered bodies, and the ferrite sintered body has a thickness of D ⁇ m. ],
  • the area of the main surface is A [mm 2 ]
  • the length of the major axis is LI [mm]
  • the length of the minor axis is L2 [mm]
  • the thickness is small while maintaining good communication characteristics. It will become cracked and cracked, and will become curved.
  • the ferrite sintered body has a principal surface with a side of less than 5 mm and a thickness of 50 mm. / zm or more 550 Those less than ⁇ m are desirable.
  • the plurality of ferrite sintered bodies are made of a low dielectric having a relative dielectric constant of less than 500, which is desired to be bonded to each other by a bonding agent made of a material with a small electromagnetic wave transmission loss. It is particularly desirable to be bonded together by a bonding agent.
  • the plurality of ferrite sintered bodies may be a laminated body in which a plurality of the sintered ferrite bodies are laminated in the thickness direction of the magnetic sheet.
  • the inductance changes according to the number of layers of the sintered sintered body, so that the communication distance can be changed. That is, the magnetic sheet according to the present invention can cope with various communication characteristics and can greatly increase the degree of design freedom.
  • the plurality of ferrite sintered bodies are filled and spread so as not to generate a gap in the same plane from the viewpoint of reducing waste materials and meeting the demand for thinning. Furthermore, depending on the shape of the principal surface of the plurality of ferrite sintered bodies, there is a case where a gap is formed when trying to spread the same in the same plane.
  • a plurality of the ferrite sintered bodies are laminated in stages so as not to generate a gap, or a predetermined magnetic powder is mixed in a gap between the plurality of ferrite sintered bodies spread in the same plane. May be added.
  • an antenna device that achieves the above-described object is an antenna device having an antenna coil, and a plurality of antenna substrates on which the antenna coil is mounted and the antenna coil are covered.
  • a magnetic sheet formed by laying a flat ferrite sintered body of the above is disposed in a state where the main surfaces thereof are joined to each other, and the ferrite sintered body has a thickness of D ⁇ m],
  • the area of the surface is A [mm 2 ]
  • the length of the major axis is LI [mm]
  • the length of the minor axis is L2 [mm]
  • the thickness is small while maintaining good communication characteristics. It will become cracked and cracked, and will become curved.
  • the above-described bonding with the antenna substrate is performed.
  • a predetermined metal shield plate may be bonded to the main surface opposite to the main surface of the magnetic sheet.
  • the antenna device may be configured such that the antenna coil is electrically connected to an external IC chip, and an IC chip mounting surface is formed on the antenna substrate.
  • the antenna coil may be configured to be electrically connected to the IC chip mounted on the IC chip mounting surface.
  • the antenna device according to the present invention in the former configuration, since it is not necessary to incorporate an IC chip, it is possible to reduce the thickness. In the latter configuration, Since there is no need for external connection with the IC chip, the degree of freedom in design can be increased, and the mounting work for the mounted body can be facilitated.
  • a method for manufacturing an antenna device that achieves the above-described object is a method for manufacturing an antenna device having an antenna coil, and a plurality of methods are provided so as to cover the antenna coil mounted on an antenna substrate.
  • the ferrite sintered body has a thickness of D [m], a main surface area of A [mm 2], and a major axis length of LI [ mm] and the length of the short axis is L2 [mm]
  • the size of the main surface of the sintered sintered body becomes smaller than a predetermined value, high rigidity is achieved while using a ferrite sintered body that is a brittle material. Can be realized, and excellent communication characteristics can be realized.
  • FIG. 1 (a) is a plan view of an antenna module shown as an embodiment of the present invention when viewed from the antenna substrate side.
  • FIG. 1 (b) is a side view of an antenna module shown as an embodiment of the present invention.
  • FIG. 2 is a bottom view of the antenna module shown as an embodiment of the present invention when a magnetic core member side cover is seen.
  • FIG. 3 (a) is a diagram for explaining the meaning of terms used for the shape of a ferrite sintered body, and is a plan view of a flight sintered body having a square main surface.
  • FIG. 3 (b) is a diagram for explaining the meaning of terms used in the shape of a ferrite sintered body, and is a plan view of a ferrite sintered body having a rectangular main surface.
  • FIG. 3 (c) is a diagram for explaining the meaning of terms used for the shape of a ferrite sintered body, and is a plan view of a flight sintered body having a polygonal main surface.
  • FIG. 4 is a side view of an antenna module shown as an embodiment of the present invention, and is a diagram illustrating a configuration in which a shield plate is provided on the antenna module shown in FIGS. 1 (a) and 1 (b).
  • FIG. 5 is a diagram for explaining a state when the antenna module shown in FIG. 4 is incorporated in a communication device.
  • FIG. 6 is a diagram for explaining the state of a drop test.
  • FIG. 7 (a) is a plan view of the antenna module shown as the embodiment of the present invention when viewed from the antenna substrate side, and is a plan view of the antenna module different from the configuration shown in FIG. 1 (a).
  • FIG. 7 (b) is a side view of the antenna module shown as the embodiment of the present invention, and is a side view of the antenna module different from the configuration shown in FIG. 1 (b).
  • FIG. 8 is a side view of an antenna module shown as an embodiment of the present invention, and is a diagram illustrating a configuration in which a shield plate is provided on the antenna module shown in FIGS. 7 (a) and 7 (b).
  • This embodiment is used in a V, so-called RFID (Radio Frequency IDentification) system, which stores various data in a readable and Zable or writable manner and has a communication function.
  • This is an antenna module in which data is read and Z or written without contact by the reader Z writer by wireless communication with the writer.
  • this antenna module is formed in a thin plate shape such as an IC (Integrated Circuit) force IC tag, and can achieve high rigidity while using a ferrite sintered body as a magnetic core member. Is.
  • the antenna module includes an antenna substrate 10 on which an antenna coil is mounted and a magnetic core as a magnetic sheet.
  • the member 20 is disposed in a state where its main surfaces are joined to each other.
  • the antenna substrate 10 includes a base film 11 having a predetermined insulating material force, and an antenna having a copper or aluminum equivalent force formed in a spiral shape on the surface of the base film 11. It consists of an air-core coil section 12 as a coil.
  • the base film 11 is formed in a sheet shape in which a main surface serving as a communication surface is substantially rectangular. As long as this base film 11 is generally used as a base material of a printed wiring board, it can be comprised regardless of the kind. Specifically, the base film 11 is a paper phenol substrate specified by the National Electrical Manufacturers Association (NEMA) as a symbol XXP, XPC, etc., and the symbol FR-2. Paper polyester substrate, specified as FR-3, paper epoxy substrate, specified as CEM-1 !, glass paper composite Epoxy board, stipulated as CHE-3 !, glass nonwoven paper composite epoxy board, glass cloth epoxy board stipulated as G-10, stipulated as FR-4, Glass cloth epoxy substrate and!
  • NEMA National Electrical Manufacturers Association
  • a so-called rigid substrate having a predetermined conductive foil such as copper foil or aluminum on one side or both sides can be used.
  • a flexible resin film such as polyimide, PET, PEN, etc. may be used.
  • an air core coil body 12 serving as a radiation electrode is exposed and formed.
  • a spiral air core coil portion 12 wound around each side of the base film 11 is formed on the surface of the base film 11.
  • the end portion on the innermost peripheral side in the spiral air-core coil portion 12 and the end portion on the outermost peripheral side in the air-core coil portion 12 are each a connecting portion formed in a part of the base film 11. It is electrically connected to signal lines 13a and 13b provided at 1 la.
  • the antenna substrate 10 is electrically connected to an external IC chip (not shown) via the covered signal lines 13a and 13b.
  • the IC chip includes, for example, an antenna such as a tuning and smoothing capacitor, a diode bridge, a CPU (Central Processing Unit), a ROM (Read Only Memory), and an array (Electrically Erasable Programmable Read Only Memory).
  • an antenna such as a tuning and smoothing capacitor, a diode bridge, a CPU (Central Processing Unit), a ROM (Read Only Memory), and an array (Electrically Erasable Programmable Read Only Memory).
  • Various members for realizing the module function are integrated into a single semiconductor chip.
  • the base film 11 may be provided with through holes for electrically connecting the front and back surfaces. Furthermore, it is desirable that the front and back surfaces of the base film 11 are covered with an overcoat material made of a predetermined insulating material in order to protect the antenna substrate 10.
  • the magnetic core member 20 is configured as a magnetic sheet in which a plurality of flat ferrite sintered bodies 21 are spread as shown in FIG.
  • the ferrite sintered bodies 21 are arranged in a state where they are laid down so as to cover the air-core coil portion 12 and the periphery thereof in the antenna substrate 10.
  • the ferrite sintered body 21 is arranged in a grid pattern when its main surface is square.
  • the ferrite sintered body 21 may be a laminated body in which a plurality of the magnetic core members 20 are laminated in the thickness direction.
  • the powerful sintered ferrite 21 has the property of strongly magnetizing even if the magnetic field to which external force is applied is weak. Therefore, even if a metal object exists around the air-core coil portion 12, it can be absorbed without leakage of the magnetic field into the metal object.
  • each ferrite sintered body 21 will be described in detail later, it is assumed that the size is defined by research conducted by the applicant of the present application.
  • the main surface of the sintered ferrite body 21 is not limited to the shape, for example, a polygon, an ellipse, a circle, etc. can do.
  • the main surface shape of the sintered sintered body 21 is an ellipse or a circle, a gap will be generated when trying to spread the same in the same plane.
  • the ferrite sintered bodies 21 are laminated in steps so that no gap is generated, or predetermined magnetic powder is placed in the gaps between the plurality of ferrite sintered bodies 21 laid in the same plane. Just add the mixed binder.
  • a bonding agent for bonding the plurality of ferrite sintered bodies 21 to each other a double-sided tape, an adhesive such as a silicon-based adhesive or an ultraviolet curing adhesive can be used.
  • the magnetic core member 20 may be sealed with a predetermined sealant in a state where the ferrite sintered body 21 is disposed.
  • a bonding agent it is desirable to use a material having a material strength with low transmission loss of electromagnetic waves. Specifically, it is desirable to use a material having a relative dielectric constant of less than 500 and a low dielectric strength.
  • Such a ferrite sintered body 21 is cut and fired in a so-called green sheet state, but may be curved during firing due to its thin thickness. Such a curvature is undesirable because it causes a situation in which a gap generated between the ferrite sintered bodies 21 is increased and a thickness of the entire antenna module increases. Such bending also induces a problem of deteriorating communication characteristics. Therefore, it is desirable that the curvature of the ferrite sintered body 21 be less than half the thickness of the ferrite sintered body 21. Specifically, the thickness of the ferrite sintered body 21 It is more desirable to keep it below 20%.
  • the size of the main surface of the ferrite sintered body 21 becomes smaller than a predetermined value by satisfying a predetermined condition as described later. For this reason, the sintered ferrite body 21 cut and fired into a large size in the state of a green sheet is a bay. It becomes difficult to tune.
  • the antenna module including the antenna substrate 10 and the magnetic core member 20 is used as, for example, a non-contact type product identification tag or a part of a communication unit in a communication device. Or be incorporated as
  • the ferrite sintered body 21 is formed in a predetermined size as described above. That is, the ferrite sintered body 12 has a thickness of D [m], a major surface area of A [mm 2 ], a major axis length of LI [mm], and a minor axis length of L2 [mm]
  • the length of the long axis means the length of the longest portion of the straight portions that define the main surface of the ferrite sintered body 21.
  • the ferrite sintered body 21 has a square main surface, one side is less than 5 [mm] and the thickness is 50 [/ ⁇ ⁇ It is realistic to use those that are above 550 [/ ⁇ ⁇ ].
  • the lower limit value of the thickness is set to 50 [m] because the limit value at which the magnetic property of the ferrite sintered body 21 can be exhibited in terms of the communication distance is 50 [m].
  • the upper limit of the thickness is set to 550 [/ ⁇ ⁇ ] in order to meet the demand for thinner antenna modules.
  • the antenna module including the magnetic core member 20 using the ferrite sintered body 21 can be used as, for example, a non-contact type product identification tag.
  • predetermined identification data relating to the product as an attached body is recorded on the IC chip connected to the antenna module.
  • the antenna module is attached to a product to be identified through a pressure-sensitive adhesive film or the like interposed on the surface of the ferrite sintered body 21 side.
  • the antenna module is recorded on the IC chip in response to receiving communication radio waves transmitted from the reader Z writer, not shown, during the distribution process and inventory management of the product. The corresponding information is read out and sent to the reader Z writer.
  • the antenna module attached to the product in this way since the ferrite sintered body 21 is interposed between the product and the air-core coil portion 12, the surface to be attached of the product is made of a metal material. Even if it is comprised, the fall of an inductance can be prevented. As a result, the antenna module can generate a predetermined induced voltage by the air-core coil section 12, and by applying this induced voltage to the IC chip, the reader Z writer can reliably read the identification data. be able to.
  • the powerful antenna module can also be incorporated in a communication device as an attached body.
  • the communication equipment here refers to mobile phones and personal digital assistants (personal digital assistants) that have built-in communication units that read and write to IC recording media such as IC cards and IC tags.
  • a portable wireless communication terminal such as PDA
  • the antenna module is incorporated in a communication device as a part of the communication unit.
  • the antenna module is laminated in the order of the antenna substrate 10, the magnetic core member 20, and the metal shield plate 30, and is arranged with its main surfaces bonded to each other.
  • the metal shield plate 30 is also made of aluminum, copper, iron, stainless steel, magnesium alloy, etc., and is opposite to the main surface of the magnetic core member 20 joined to the antenna substrate 10 via a double-sided tape or the like. It is joined to the main surface.
  • Such an antenna module is laid with a plurality of flat ferrite sintered bodies 21 so as to cover the air core coil portion 12 mounted on the antenna substrates 10, 10 ', and if necessary, A plurality of ferrite sintered bodies 21 are laminated in the thickness direction via a predetermined bonding agent, and ferrite It can be manufactured by joining a predetermined metal shield plate 30 to the sintered body 21.
  • the antenna module has a shield plate 30 on the side opposite to the antenna substrate 10 that serves as a communication surface as an attachment surface, and is attached to the surface on the shield plate 30 side. It is attached to a predetermined attachment 40 formed on the communication device via a pressure-sensitive adhesive film.
  • the shield plate 30 can prevent radio waves generated during operation of the antenna coil from entering the communication device, thereby preventing malfunction of the communication device. it can.
  • the metal part 41 such as a casing part or a wiring part of a communication device is usually provided around and on the upper surface of the attachment part 40. That is, the antenna module is often incorporated into a communication device in a state surrounded by a powerful metal object 41.
  • the antenna module even if there is a metal object 41 between the communication device mounting portion 40, the communication radio wave radiated toward the air-core coil portion 12 is transmitted to the ferrite sintered body. Since it can be absorbed by 21, the leakage of the magnetic field to the metal object 41 side can be suppressed. Therefore, in the antenna module, generation of eddy current due to the leakage magnetic field in the metal object 41 can be suppressed, and deterioration of communication characteristics can be prevented.
  • the shield plate 30 even if the amount and arrangement of the metal object 41 in the mounting part 40 of the communication device are different, it is possible to eliminate the influence of the antenna coil. And stable communication characteristics can be secured. That is, in the antenna module, by providing the shield plate 30, it becomes possible to exhibit desired communication characteristics regardless of the installation environment of the antenna coil.
  • the applicant of the present application actually configured the antenna module, attached it to a commercially available mobile phone (S O506ic; manufactured by Soichi 'Ericsson Mopile Communications Co., Ltd.), performed a drop test, and sintered the ferrite at that time. In addition to examining the condition of the body, we also measured the communication characteristics.
  • a mobile phone 60 with an antenna module 50 attached thereto The mobile phone 60 is in a vertical state so that the side on which the antenna module 50 is provided is the lower side, and the upper side of the mobile phone 60 on which the antenna module 50 is not provided is a predetermined clip.
  • the state fixed using 70 was defined as the initial state before dropping.
  • the mobile phone 60 is naturally dropped five times from a height of 150 cm, and then the mobile phone 60 is disassembled and the antenna module 50 is taken out to check the state of the fluorescent sintered body.
  • the sintered body is classified into three types: when it is not cracked, when it is cracked and missing, and when it is cracked and damaged, and the evaluations are “ ⁇ ”, “ ⁇ ⁇ ”, and “ ⁇ ” respectively.
  • a hard plastic with a thickness of 2 mm and a hardness of 98 or more (Type D durometer) was laid on the upper layer of the concrete floor.
  • the main surface is a square of 1.2 [mm] X 1.2 [mm] and the thickness is 130 [/ ⁇ m]
  • the main surface is 3 [mm] X 3 [mm] square with a thickness of 300 [m]
  • main surface 1.4 [mm] XI .4 [mm] square Four types were prepared: one with a thickness of 190 [m], one with a square of 2 [mm] x 2 [mm] and a thickness of 400 [m].
  • the main surface is a square of 5 [mm] X 5 [mm] and the thickness is 130 [/ ⁇ ⁇ ], and the main surface is 10 [mm] X 10 [mm
  • a double-sided tape or a silicon-based adhesive was prepared as a bonding agent for bonding a plurality of sintered ferrite bodies to each other. The results are shown in the following Tables 1 to 3.
  • Example 2 Furthermore, as a result of measuring the change in the communication distance when the ferrite sintered body used in Example 1 was stacked, as shown in Table 2 above, as the number of layers increased, the inductance increased and the Q value also increased. As a result of the increase, the communication distance was increased.
  • the antenna module shown as the embodiment of the present invention has a ferrite sintered body that is a brittle material by specifying the size of the ferrite sintered body. , Rigidity can be realized, and excellent communication characteristics can be realized.
  • the present invention is not limited to the above-described embodiment.
  • the power described as the antenna module is a type that is electrically connected to an external IC chip.
  • the present invention can also be applied to a type in which an IC chip is mounted on an antenna substrate. it can.
  • the antenna module may include an IC chip 15 as shown in a plan view in FIG. 7 (a) and a side view in FIG. 7 (b). That is, in such an antenna module, a core material that also has, for example, urethane resin is provided on a part of the main surface of the base film 11 that constitutes the antenna substrate 10 ′ that is to be attached to the magnetic core member 20. Thus, an IC chip mounting surface is formed, and the IC chip 15 mounted on the IC chip mounting surface is electrically connected to both end portions of the air-core coil unit 12.
  • Such an antenna module can also be used for a contactless product identification tag or a communication unit in a communication device.
  • an antenna substrate 10 ′, a magnetic core member 20, and a metal shield plate 30 are laminated in this order, and their main surfaces are mutually stacked. Are arranged in a joined state.
  • the antenna module has the shield plate 30 side opposite to the antenna substrate 10 ′ serving as the communication surface as the adherend surface, and is interposed on the shield plate 30 side surface. It is attached to a predetermined attachment part 40 formed on the communication device through the pressure-sensitive adhesive film or the like.
  • the IC chip mounting portion may be provided on the antenna substrate 10 on the communication surface side.
  • the IC chip mounting portion can be placed at an arbitrary position depending on the shape of the air core coil portion 12 that does not need to be formed in the innermost peripheral region of the air core coil portion 12. It can also be formed.
  • the power described for the antenna module used as an IC card or IC tag is not limited to the shape as a powerful IC card or IC tag, and other configurations depending on the application. It can be applied to various shapes.

Abstract

This invention provides an antenna device that can realize high rigidity while using a fragile ferrite sinter and can realize excellent communication properties. In this antenna device, an antenna module comprises a magnetic core member (20) comprising a plurality of flat-shaped ferrite sinters (21) spread so as to cover an antenna coil mounted on an antenna substrate. The ferrite sinter (21) has a size satisfying requirements of 2 < D/A, 0 < L1 < 5 × 21/2, and 1 ≤ L1/L2 ≤ 2 wherein D represents the thickness of the ferrite sinter (21), µm; A represents the area of a main plane, mm2; L1 represents the length of major axis, mm; and L2 represents the length of minor axis, mm.

Description

明 細 書  Specification
磁性シート、並びにアンテナ装置及びアンテナ装置の製造方法 技術分野  Technical field of magnetic sheet, antenna device, and method of manufacturing antenna device
[0001] 本発明は、 ICカードや ICタグ等に用いて好適な磁性シート、並びにアンテナ装置 及びアンテナ装置の製造方法に関する。  The present invention relates to a magnetic sheet suitable for use in IC cards, IC tags, and the like, an antenna device, and a method for manufacturing the antenna device.
背景技術  Background art
[0002] 従来から、 V、わゆる RFID (Radio Frequency IDentification)と称される個体管理を 行うシステムが各種業界で注目されている。この RFIDシステムは、トランスボンダと称 される各種データを読み出し及び Z又は書き込み可能に記憶するとともに通信機能 を有する小型の非接触型集積回路 (Integrated Circuit;以下、 ICという。）デバイスと 所定のリーダ Zライタとの間で無線通信を行うことにより、トランスボンダに対して非接 触でデータの読み出し及び Z又は書き込みを行う技術である。この RFIDシステムは 、例えば、トランスボンダを ICタグとして構成し、この ICタグを商品に取り付けることに よって生産 ·物流管理を行う用途の他、トランスボンダを ICカードとして構成し、交通 機関の料金徴収や身分証明書、さらには電子マネーと 、つた様々な用途への適用 が期待されている。  Conventionally, an individual management system called V, so-called RFID (Radio Frequency IDentification), has attracted attention in various industries. This RFID system is a small non-contact integrated circuit (hereinafter referred to as an IC) device that stores various data called a transbonder so that it can be read and Z or writable, and has a communication function. This is a technology that performs data reading and Z or writing without contact with the transponder by performing wireless communication with the Z writer. This RFID system, for example, configures a transponder as an IC tag and attaches the IC tag to a product to perform production and logistics management. In addition, the transponder is configured as an IC card to collect charges for transportation. It is expected to be used for various purposes such as ID cards, and even electronic money.
[0003] ここで、 ICカードや ICタグとしては、情報を記憶した ICチップと共振用のコンデンサ とをアンテナコイルに電気的に接続したものが知られている。これらは、リーダ/ライ タの送受信アンテナ力 アンテナコイルへと所定の周波数の電波を発信することによ つて ICチップに記憶された情報が読み取られたり、特定周波数の電波に対して共振 する力否かによって識別又は監視されたりするように構成されて 、る。これにカ卩えて、 ICカードや ICタグの多くは、 ICチップに記憶されている情報を更新したり、履歴情報 等を書き込んだりすることが可能に構成されている。  Here, as an IC card or an IC tag, an IC card in which information is stored and a resonance capacitor are electrically connected to an antenna coil is known. These are the transmission / reception antenna power of the reader / writer. By transmitting radio waves of a predetermined frequency to the antenna coil, the information stored in the IC chip can be read, or whether the power can resonate with radio waves of a specific frequency. It is configured to be identified or monitored by In addition to this, many IC cards and IC tags are configured to be able to update information stored in the IC chip and write history information.
[0004] このような ICカードや ICタグとしては、平面内に渦巻き状に卷回されたアンテナコィ ルに対して、当該アンテナコイルの平面と略平行となるように軟磁性材料を挿入した アンテナモジュールが開示されている（例えば、特許文献 1等参照。 ) oこのアンテナ モジュールにおいては、アモルファスシートや電磁鋼板からなる軟磁性材料を、アン テナコイルの平面と略平行となるように挿入することにより、当該アンテナモジュール 全体の薄層化を図って 、る。 [0004] As such an IC card or IC tag, an antenna module in which a soft magnetic material is inserted so as to be substantially parallel to the plane of the antenna coil with respect to the antenna coil wound in a plane. (For example, refer to Patent Document 1 etc.) o In this antenna module, soft magnetic material made of amorphous sheet or electromagnetic steel plate is By inserting the antenna module so as to be substantially parallel to the plane of the tenor coil, the antenna module as a whole is made thinner.
[0005] しかしながら、かかるアンテナモジュールにおいては、軟磁性材料がアモルファスシ ートゃ電磁鋼板力もなるため、キャリア周波数が 100kHz程度の場合には使用可能 な Q値が得られる力 キャリア周波数が数 MHz〜数十 MHz程度に高周波となる場 合には、軟磁性材料であるアモルファスシートや電磁鋼板に渦電流が発生し、 Q値 が低下するという問題がある。そのため、このアンテナモジュールは、 13. 56MHzの キャリア周波数で動作する RFID技術を利用した ICカードや ICタグには適用すること ができない。  [0005] However, in such an antenna module, since the soft magnetic material is also an amorphous sheet or an electromagnetic steel plate, the force that can be used when the carrier frequency is about 100 kHz is obtained. When the frequency becomes as high as several tens of MHz, an eddy current is generated in the amorphous sheet or electromagnetic steel sheet, which is a soft magnetic material, and the Q value is lowered. Therefore, this antenna module cannot be applied to IC cards and IC tags using RFID technology that operates at a carrier frequency of 13.56 MHz.
[0006] これに対して、従来から、高周波に対応できる軟磁性材料としてフェライト焼結体が 知られている。しかしながら、フェライト焼結体は、脆性材料であることから、近年の IC カードや ICタグの薄型化への要求に対応するために薄く形成した場合には、割れや すいものとなり、耐衝撃性が極めて低いという問題がある。そこで、軟磁性金属、ァモ ルファス又はフェライトの粉末若しくはフレークと、プラスチック又はゴムとの複合材に よって軟磁性材料を形成することにより、脆弱なフェライト焼結体を用いる場合に比べ て剛性が高く且つ比較的高 ヽ周波数にぉ 、ても使用し得るようにしたアンテナコイル が提案されている (例えば、特許文献 2等参照。 ) 0 [0006] On the other hand, a ferrite sintered body is conventionally known as a soft magnetic material that can cope with a high frequency. However, since the ferrite sintered body is a brittle material, if it is formed thin in order to meet the recent demand for thinner IC cards and IC tags, it becomes brittle and has impact resistance. There is a problem that it is extremely low. Therefore, by forming a soft magnetic material with a composite material of soft magnetic metal, amorphous powder or ferrite powder or flakes and plastic or rubber, the rigidity is higher than when using a fragile ferrite sintered body. and relatively highヽfrequency Nio, antenna coils adapted to be used has been proposed (e.g., see Patent Document 2, etc..) 0
[0007] また、特許文献 3には、平面内に渦巻き状に卷回されたアンテナコイルと、当該アン テナコイルの平面と略平行となるように配設したフェライト焼結体とを積層して構成さ れるアンテナモジュールが開示されて 、る。 [0007] Further, Patent Document 3 is configured by laminating an antenna coil wound in a spiral shape in a plane and a ferrite sintered body disposed so as to be substantially parallel to the plane of the antenna coil. An antenna module is disclosed.
[0008] なお、特許文献 2に記載されたアンテナコイルは、様々な通信機器に組み込まれる 場合があるため、識別する物品以外であっても周辺に金属物が存在する場合には、 その影響を受けやすくなる。この影響を回避するために、通信面の裏面 (被着面）に 金属製のシールド板を貼付し、金属物による通信特性の変動を抑制するようにした 技術が提案されている。しかしながら、この技術においては、シールド板によってアン テナコイルの通信特性の変動は抑制されるものの、このことは、逆に、シールド板によ つてアンテナコイルの通信特性を一定のレベルに低下させていることにもなる。  [0008] Note that the antenna coil described in Patent Document 2 may be incorporated into various communication devices. Therefore, if there is a metal object in the vicinity even if it is not an article to be identified, the effect is affected. It becomes easy to receive. In order to avoid this effect, a technology has been proposed in which a metal shield plate is attached to the back surface (attached surface) of the communication surface to suppress fluctuations in communication characteristics due to metal objects. However, in this technology, fluctuations in the communication characteristics of the antenna coil are suppressed by the shield plate. Conversely, this means that the communication characteristics of the antenna coil are lowered to a certain level by the shield plate. It also becomes.
[0009] 特許文献 1 :特開 2000— 48152号公報 特許文献 2 :特開 2002— 325013号公報 Patent Document 1: Japanese Patent Application Laid-Open No. 2000-48152 Patent Document 2: Japanese Patent Laid-Open No. 2002-325013
特許文献 3：特開 2000 - 113142号公報  Patent Document 3: Japanese Unexamined Patent Publication No. 2000-113142
[0010] 現在、 13. 65MHzのキャリア周波数で動作する RFID技術を用いた ICカードや IC タグにおいては、できるだけ長い通信距離を実現することや、リーダ Zライタと相対す る場合の平面状の広い通信エリアでの確実な動作環境を実現することが要求されて いる。 [0010] Currently, in IC cards and IC tags that use RFID technology that operates at a carrier frequency of 13.65 MHz, it is possible to achieve the longest possible communication distance and the flatness when facing the reader Z writer. Realization of a reliable operating environment in the communication area is required.
[0011] し力しながら、上述した特許文献 2に記載されたアンテナコイルにおいては、軟磁性 材料としてフェライト焼結体を用いた同じ構成のアンテナコイルと比較して、通信特性 が劣化することが確認されている。したがって、通信特性が良好なフェライト焼結体を 用いたアンテナモジュールの実現が待望されて 、る。  [0011] However, in the antenna coil described in Patent Document 2 described above, communication characteristics may be deteriorated as compared with an antenna coil having the same configuration using a ferrite sintered body as a soft magnetic material. It has been confirmed. Therefore, the realization of an antenna module using a ferrite sintered body with good communication characteristics is awaited.
[0012] 本発明は、このような実情に鑑みてなされたものであり、脆弱材料であるフェライト焼 結体を用いながらも高 、剛性を実現することができ、優れた通信特性を実現すること ができる磁性シート、並びにアンテナ装置及びアンテナ装置の製造方法を提供する ことを目的とする。  [0012] The present invention has been made in view of such circumstances, and can achieve high rigidity while using a ferrite sintered body that is a brittle material, and realize excellent communication characteristics. An object of the present invention is to provide a magnetic sheet that can be used, an antenna device, and a method for manufacturing the antenna device.
[0013] 本願出願人は、フェライト焼結体に関して鋭意研究を重ねた結果、高 、剛性と優れ た通信特性とをともに実現することができるフェライト焼結体の大きさを見出し、本発 明を完成させるに至った。  [0013] As a result of earnest research on the ferrite sintered body, the applicant of the present application has found the size of the ferrite sintered body capable of realizing both high and rigidity and excellent communication characteristics, and has made the present invention. It came to complete.
[0014] すなわち、上述した目的を達成する本発明にかかる磁性シートは、複数の平板状 のフェライト焼結体を敷き詰めて形成されており、上記フェライト焼結体は、その厚さ を D^ m]とし、主面の面積を A [mm2]とし、長軸の長さを LI [mm]とし、短軸の長 さを L2 [mm]としたとき、 That is, the magnetic sheet according to the present invention that achieves the above-mentioned object is formed by spreading a plurality of flat ferrite sintered bodies, and the ferrite sintered body has a thickness of D ^ m. ], The area of the main surface is A [mm 2 ], the length of the major axis is LI [mm], and the length of the minor axis is L2 [mm]
2< D/A、且つ、 0<Ll < 5 X 21/2、且つ、 1≤L1/L2≤2 2 <D / A and 0 <Ll <5 X 2 1/2 and 1≤L1 / L2≤2
の条件を満たす大きさに形成されて ヽることを特徴として ヽる。  It is characterized by being formed in a size that satisfies the following conditions.
[0015] このような本発明に力かる磁性シートにおいては、フェライト焼結体の主面の大きさ が所定値よりも小さくなることから、良好な通信特性を保ちながらも、厚さが薄くてもひ びが入ったり割れたりしに《なり、湾曲もしに《なる。 [0015] In the magnetic sheet according to the present invention, since the size of the main surface of the ferrite sintered body is smaller than a predetermined value, the thickness is small while maintaining good communication characteristics. It will become cracked and cracked, and will become curved.
[0016] 具体的には、上記フェライト焼結体は、通信特性の観点と薄型化の要求とをともに 満足するために、その主面の 1辺が 5mm未満であり、且つ、厚さが 50 /z m以上 550 μ m未満であるものが望ましい。 [0016] Specifically, in order to satisfy both the viewpoint of communication characteristics and the demand for thinning, the ferrite sintered body has a principal surface with a side of less than 5 mm and a thickness of 50 mm. / zm or more 550 Those less than μm are desirable.
[0017] ここで、複数の上記フェライト焼結体は、電磁波の透過損失が少な 、材料からなる 接合剤によって互いに接合されるのが望ましぐ比誘電率が 500未満の低誘電体か らなる接合剤によって互いに接合されるのが特に望ましい。  [0017] Here, the plurality of ferrite sintered bodies are made of a low dielectric having a relative dielectric constant of less than 500, which is desired to be bonded to each other by a bonding agent made of a material with a small electromagnetic wave transmission loss. It is particularly desirable to be bonded together by a bonding agent.
[0018] また、複数の上記フェライト焼結体は、当該磁性シートの厚み方向に複数積層した 積層体としてもよい。本発明に力かる磁性シートは、アンテナモジュールに適用した 場合に、フ ライト焼結体の層数に応じてインダクタンスが変化することから、通信距 離を変化させることができる。すなわち、本発明にかかる磁性シートは、様々な通信 特性に対応することが可能となり、その設計自由度を大幅に高めることができる。  [0018] The plurality of ferrite sintered bodies may be a laminated body in which a plurality of the sintered ferrite bodies are laminated in the thickness direction of the magnetic sheet. When the magnetic sheet according to the present invention is applied to an antenna module, the inductance changes according to the number of layers of the sintered sintered body, so that the communication distance can be changed. That is, the magnetic sheet according to the present invention can cope with various communication characteristics and can greatly increase the degree of design freedom.
[0019] さらに、複数の上記フェライト焼結体は、廃材を少なくするとともに薄型化の要求に 対応する観点から、同一平面内に間隙が生じないように充填して敷き詰められている のが望ましい。さらにまた、複数の上記フェライト焼結体は、その主面形状によっては 、同一平面内に敷き詰めようとすると間隙が生じてしまう場合があるが、力かる場合に は、本発明に力かる磁性シートにおいては、間隙が生じないように段違いに複数の 上記フェライト焼結体を積層したり、同一平面内に敷き詰められた複数の上記フェラ イト焼結体の間隙に所定の磁性粉が混入されたバインダを添加したりしてもよい。  Furthermore, it is desirable that the plurality of ferrite sintered bodies are filled and spread so as not to generate a gap in the same plane from the viewpoint of reducing waste materials and meeting the demand for thinning. Furthermore, depending on the shape of the principal surface of the plurality of ferrite sintered bodies, there is a case where a gap is formed when trying to spread the same in the same plane. In the binder, a plurality of the ferrite sintered bodies are laminated in stages so as not to generate a gap, or a predetermined magnetic powder is mixed in a gap between the plurality of ferrite sintered bodies spread in the same plane. May be added.
[0020] また、上述した目的を達成する本発明に力かるアンテナ装置は、アンテナコイルを 有するアンテナ装置であって、上記アンテナコイルが実装されたアンテナ基板と、上 記アンテナコイルを覆うように複数の平板状のフェライト焼結体を敷き詰めて形成され た磁性シートとが、互いにその主面を接合した状態で配設され、上記フェライト焼結 体は、その厚さを D^ m]とし、主面の面積を A [mm2]とし、長軸の長さを LI [mm] とし、短軸の長さを L2 [mm]としたとき、 [0020] Further, an antenna device according to the present invention that achieves the above-described object is an antenna device having an antenna coil, and a plurality of antenna substrates on which the antenna coil is mounted and the antenna coil are covered. A magnetic sheet formed by laying a flat ferrite sintered body of the above is disposed in a state where the main surfaces thereof are joined to each other, and the ferrite sintered body has a thickness of D ^ m], When the area of the surface is A [mm 2 ], the length of the major axis is LI [mm], and the length of the minor axis is L2 [mm]
2< D/A、且つ、 0<Ll < 5 X 21/2、且つ、 1≤L1/L2≤2 2 <D / A and 0 <Ll <5 X 2 1/2 and 1≤L1 / L2≤2
の条件を満たす大きさに形成されて ヽることを特徴として ヽる。  It is characterized by being formed in a size that satisfies the following conditions.
[0021] このような本発明に力かるアンテナ装置においては、フェライト焼結体の主面の大き さが所定値よりも小さくなることから、良好な通信特性を保ちながらも、厚さが薄くても ひびが入ったり割れたりしに《なり、湾曲もしに《なる。  In such an antenna device according to the present invention, since the size of the main surface of the sintered ferrite body is smaller than a predetermined value, the thickness is small while maintaining good communication characteristics. It will become cracked and cracked, and will become curved.
[0022] また、本発明に力かるアンテナ装置においては、上記アンテナ基板と接合する上記 磁性シートの主面とは逆の主面に、所定の金属製のシールド板を接合してもよい。こ れにより、本発明に力かるアンテナ装置においては、被取付体の取り付け部に金属 物が存在する場合であっても、その金属物の影響を受けず、また、アンテナコイルの 動作時に発生する電波が被取付体に対して侵入するのをシールド板によって阻止 することができ、当該被取付体の誤作動を防止することができる。さらに、本発明にか 力るアンテナ装置においては、シールド板を設けることにより、被取付体の取り付け部 における金属物の量や配置が異なる場合であっても、アンテナコイルが受ける影響 のバラツキを排除することができ、安定した通信特性を確保することが可能となる。 [0022] Further, in the antenna device according to the present invention, the above-described bonding with the antenna substrate is performed. A predetermined metal shield plate may be bonded to the main surface opposite to the main surface of the magnetic sheet. As a result, in the antenna device according to the present invention, even when a metal object is present in the attachment portion of the mounted body, it is not affected by the metal object, and is generated during operation of the antenna coil. The shield plate can prevent radio waves from entering the attached body, and malfunction of the attached body can be prevented. Furthermore, in the antenna device according to the present invention, by providing a shield plate, even when the amount and arrangement of metal objects at the mounting portion of the mounted body are different, variation in the influence of the antenna coil is eliminated. Therefore, stable communication characteristics can be ensured.
[0023] なお、本発明に力かるアンテナ装置は、上記アンテナコイルが外部の ICチップと電 気的に接続されるように構成されてもよぐまた、上記アンテナ基板に ICチップ搭載 面を形成しておき、上記アンテナコイルが上記 ICチップ搭載面に搭載された ICチッ プと電気的に接続されるように構成されてもょ ヽ。本発明にカゝかるアンテナ装置にお いては、前者の構成の場合には、 ICチップを内蔵する必要がないことから、より薄型 化を図ることが可能となり、後者の構成の場合には、 ICチップとの外部接続を必要と しないことから、設計自由度を高くすることができるとともに、被取付体に対する取り付 け作業を容易にすることができる。  [0023] The antenna device according to the present invention may be configured such that the antenna coil is electrically connected to an external IC chip, and an IC chip mounting surface is formed on the antenna substrate. In addition, the antenna coil may be configured to be electrically connected to the IC chip mounted on the IC chip mounting surface. In the antenna device according to the present invention, in the former configuration, since it is not necessary to incorporate an IC chip, it is possible to reduce the thickness. In the latter configuration, Since there is no need for external connection with the IC chip, the degree of freedom in design can be increased, and the mounting work for the mounted body can be facilitated.
[0024] さらに、上述した目的を達成する本発明にかかるアンテナ装置の製造方法は、アン テナコイルを有するアンテナ装置の製造方法であって、アンテナ基板上に実装され た上記アンテナコイルを覆うように複数の平板状のフェライト焼結体を敷き詰めるェ 程と、所定の接合剤を介して複数の上記フェライト焼結体を厚み方向に複数積層す る工程と、積層した上記フェライト焼結体に所定の金属製のシールド板を接合するェ 程とを備え、上記フェライト焼結体は、その厚さを D [ m]とし、主面の面積を A[mm 2]とし、長軸の長さを LI [mm]とし、短軸の長さを L2 [mm]としたとき、  Furthermore, a method for manufacturing an antenna device according to the present invention that achieves the above-described object is a method for manufacturing an antenna device having an antenna coil, and a plurality of methods are provided so as to cover the antenna coil mounted on an antenna substrate. A flat ferrite sintered body, a step of laminating a plurality of ferrite sintered bodies in the thickness direction via a predetermined bonding agent, and a predetermined metal on the laminated ferrite sintered bodies. The ferrite sintered body has a thickness of D [m], a main surface area of A [mm 2], and a major axis length of LI [ mm] and the length of the short axis is L2 [mm]
2< D/A、且つ、 0<Ll < 5 X 21/2、且つ、 1≤L1/L2≤2 2 <D / A and 0 <Ll <5 X 2 1/2 and 1≤L1 / L2≤2
の条件を満たす大きさに形成されたものであることを特徴としている。  It is characterized by being formed in a size satisfying the condition.
[0025] このような本発明に力かるアンテナ装置の製造方法にぉ 、ては、フェライト焼結体 の主面の大きさが所定値よりも小さくなることから、良好な通信特性を保ちながらも、 厚さが薄くてもひびが入ったり割れたりしにくぐ湾曲もしにくいアンテナ装置を製造 することができる。また、本発明にかかるアンテナ装置の製造方法においては、フェラ イト焼結体を敷き詰めて製造することから、フェライト焼結体の型抜き工程が不要とな り、型抜き時にひびが入ったりする事態を招来することがなぐ廃材を減らして歩留ま りを向上させることができる。 [0025] In such a method of manufacturing an antenna device that is effective in the present invention, since the size of the main surface of the sintered ferrite body is smaller than a predetermined value, it is possible to maintain good communication characteristics. Manufactures antenna devices that are not easily cracked or cracked even when they are thin can do. In addition, in the method for manufacturing an antenna device according to the present invention, since the ferrite sintered body is manufactured by laying down, the die-cutting process of the ferrite sintered body becomes unnecessary, and cracks are generated when the die is cut. It is possible to improve the yield by reducing the amount of waste materials that are not invited.
[0026] 以上のような本発明によれば、フ ライト焼結体の主面の大きさが所定値よりも小さ くなることから、脆弱材料であるフェライト焼結体を用いながらも高い剛性を実現する ことができ、優れた通信特性を実現することができる。  [0026] According to the present invention as described above, since the size of the main surface of the sintered sintered body becomes smaller than a predetermined value, high rigidity is achieved while using a ferrite sintered body that is a brittle material. Can be realized, and excellent communication characteristics can be realized.
図面の簡単な説明  Brief Description of Drawings
[0027] [図 1(a)]本発明の実施の形態として示すアンテナモジュールをアンテナ基板側からみ たときの平面図である。  FIG. 1 (a) is a plan view of an antenna module shown as an embodiment of the present invention when viewed from the antenna substrate side.
[図 1(b)]本発明の実施の形態として示すアンテナモジュールの側面図である。  FIG. 1 (b) is a side view of an antenna module shown as an embodiment of the present invention.
[図 2]本発明の実施の形態として示すアンテナモジュールを磁芯部材側カもみたとき の底面図である。  FIG. 2 is a bottom view of the antenna module shown as an embodiment of the present invention when a magnetic core member side cover is seen.
[図 3(a)]フェライト焼結体の形状について用いる用語の意味について説明するための 図であり、主面が正方形であるフ ライト焼結体の平面図である。  FIG. 3 (a) is a diagram for explaining the meaning of terms used for the shape of a ferrite sintered body, and is a plan view of a flight sintered body having a square main surface.
[図 3(b)]フェライト焼結体の形状にっ 、て用いる用語の意味にっ 、て説明するための 図であり、主面が長方形であるフ ライト焼結体の平面図である。  [FIG. 3 (b)] FIG. 3 (b) is a diagram for explaining the meaning of terms used in the shape of a ferrite sintered body, and is a plan view of a ferrite sintered body having a rectangular main surface.
[図 3(c)]フェライト焼結体の形状について用いる用語の意味について説明するための 図であり、主面が多角形であるフ ライト焼結体の平面図である。  [FIG. 3 (c)] is a diagram for explaining the meaning of terms used for the shape of a ferrite sintered body, and is a plan view of a flight sintered body having a polygonal main surface.
[図 4]本発明の実施の形態として示すアンテナモジュールの側面図であり、図 1(a)及 び図 1(b)に示すアンテナモジュールにシールド板を設けた構成を説明する図である  FIG. 4 is a side view of an antenna module shown as an embodiment of the present invention, and is a diagram illustrating a configuration in which a shield plate is provided on the antenna module shown in FIGS. 1 (a) and 1 (b).
[図 5]図 4に示すアンテナモジュールを通信機器に組み込んだときの様子を説明する 図である。 FIG. 5 is a diagram for explaining a state when the antenna module shown in FIG. 4 is incorporated in a communication device.
[図 6]落下試験の様子を説明するための図である。  FIG. 6 is a diagram for explaining the state of a drop test.
[図 7(a)]本発明の実施の形態として示すアンテナモジュールをアンテナ基板側からみ たときの平面図であり、図 1(a)に示す構成とは異なるアンテナモジュールの平面図で ある。 [図 7(b)]本発明の実施の形態として示すアンテナモジュールの側面図であり、図 1(b) に示す構成とは異なるアンテナモジュールの側面図である。 FIG. 7 (a) is a plan view of the antenna module shown as the embodiment of the present invention when viewed from the antenna substrate side, and is a plan view of the antenna module different from the configuration shown in FIG. 1 (a). FIG. 7 (b) is a side view of the antenna module shown as the embodiment of the present invention, and is a side view of the antenna module different from the configuration shown in FIG. 1 (b).
[図 8]本発明の実施の形態として示すアンテナモジュールの側面図であり、図 7(a)及 び図 7(b)に示すアンテナモジュールにシールド板を設けた構成を説明する図である  FIG. 8 is a side view of an antenna module shown as an embodiment of the present invention, and is a diagram illustrating a configuration in which a shield plate is provided on the antenna module shown in FIGS. 7 (a) and 7 (b).
発明を実施するための最良の形態 BEST MODE FOR CARRYING OUT THE INVENTION
[0028] 以下、本発明を適用した具体的な実施の形態について図面を参照しながら詳細に 説明する。 Hereinafter, specific embodiments to which the present invention is applied will be described in detail with reference to the drawings.
[0029] この実施の开態は、 V、わゆる RFID (Radio Frequency IDentification)システムにお いて用いられ、各種データを読み出し及び Z又は書き込み可能に記憶するとともに 通信機能を有し、所定のリーダ Zライタとの間で無線通信を行うことにより、当該リー ダ Zライタによって非接触でデータの読み出し及び Z又は書き込みが行われるアン テナモジュールである。特に、このアンテナモジュールは、 IC (Integrated Circuit)力 ードゃ ICタグ等、薄板状に形成されるものであり、磁芯部材としてフェライト焼結体を 用いながらも高い剛性を実現することができるものである。  [0029] This embodiment is used in a V, so-called RFID (Radio Frequency IDentification) system, which stores various data in a readable and Zable or writable manner and has a communication function. This is an antenna module in which data is read and Z or written without contact by the reader Z writer by wireless communication with the writer. In particular, this antenna module is formed in a thin plate shape such as an IC (Integrated Circuit) force IC tag, and can achieve high rigidity while using a ferrite sintered body as a magnetic core member. Is.
[0030] アンテナモジュールは、図 1(a)に平面図及び図 1(b)に側面図を示すように、その内 部に、アンテナコイルを実装したアンテナ基板 10と、磁性シートとしての磁芯部材 20 とが、互いにその主面を接合した状態で配設される。  [0030] As shown in FIG. 1 (a), a plan view and a side view in FIG. 1 (b), the antenna module includes an antenna substrate 10 on which an antenna coil is mounted and a magnetic core as a magnetic sheet. The member 20 is disposed in a state where its main surfaces are joined to each other.
[0031] アンテナ基板 10は、図 1(a)に示すように、所定の絶縁材料力もなるベースフィルム 11と、このベースフィルム 11の面上に渦巻き状に形成された銅又はアルミニウム等 力もなるアンテナコイルとしての空芯コイル部 12とから構成される。  As shown in FIG. 1 (a), the antenna substrate 10 includes a base film 11 having a predetermined insulating material force, and an antenna having a copper or aluminum equivalent force formed in a spiral shape on the surface of the base film 11. It consists of an air-core coil section 12 as a coil.
[0032] ベースフィルム 11は、通信面となる主面が略矩形状のシート状に形成される。この ベースフィルム 11は、プリント配線基板の基材として一般に用いられるものであれば 、その種類を問わずいずれを用いても構成することができる。具体的には、ベースフ イルム 11としては、米国電気製造業者協会 (National Electrical Manufacturers Assoc iation ;NEMA)による記号 XXP, XPC等として規定されている紙フエノール基板、同 記号 FR— 2として規定されて ヽる紙ポリエステル基板、同記号 FR— 3として規定され て 、る紙エポキシ基板、同記号 CEM— 1として規定されて!、るガラス紙コンポジット エポキシ基板、同記号 CHE— 3として規定されて!、るガラス不織紙コンポジットェポ キシ基板、同記号 G— 10として規定されているガラス布エポキシ基板、同記号 FR— 4として規定されて 、るガラス布エポキシ基板と!/、つた銅箔やアルミニウム等の所定の 導電体箔が片面又は両面に施された自己支持性を有するいわゆるリジッド基板を用 いることができる。また、ベースフィルム 11としては、例えば、ポリイミド、 PET、 PEN 等のフレキシブル性を有する榭脂フィルムを用いてもよ 、。 [0032] The base film 11 is formed in a sheet shape in which a main surface serving as a communication surface is substantially rectangular. As long as this base film 11 is generally used as a base material of a printed wiring board, it can be comprised regardless of the kind. Specifically, the base film 11 is a paper phenol substrate specified by the National Electrical Manufacturers Association (NEMA) as a symbol XXP, XPC, etc., and the symbol FR-2. Paper polyester substrate, specified as FR-3, paper epoxy substrate, specified as CEM-1 !, glass paper composite Epoxy board, stipulated as CHE-3 !, glass nonwoven paper composite epoxy board, glass cloth epoxy board stipulated as G-10, stipulated as FR-4, Glass cloth epoxy substrate and! /, A so-called rigid substrate having a predetermined conductive foil such as copper foil or aluminum on one side or both sides can be used. Further, as the base film 11, for example, a flexible resin film such as polyimide, PET, PEN, etc. may be used.
[0033] このようなベースフィルム 11の表面には、放射電極となる空芯コイル部体 12が露出 形成されて構成される。具体的には、アンテナ基板 10においては、ベースフィルム 1 1の面上に、当該ベースフィルム 11の各辺に沿って卷回された渦巻き状の空芯コィ ル部 12が形成されている。そして、渦巻き状の空芯コイル部 12における最内周側の 端部と、当該空芯コイル部 12における最外周側の端部は、それぞれ、ベースフィル ム 11の一部に形成された連結部 1 laに設けられた信号線 13a, 13bに電気的に接 続される。アンテナ基板 10は、カゝかる信号線 13a, 13bを介して、図示しない外部の I Cチップと電気的に接続される。なお、 ICチップは、例えば、同調用及び平滑用のコ ンデンサ、ダイオードブリッジ、 CPU (Central Processing Unit)、 ROM (Read Only M emory)、並び【こ EEPROM (Electrically Erasable Programmable Read Only Memory )といった、アンテナモジュールの機能を実現するための各種部材を単一の半導体 チップ等として集積回路化したものである。また、ベースフィルム 11には、その表裏面 を電気的に接続するためのスルーホールが穿設されてもよい。さらに、ベースフィル ム 11の表裏面は、当該アンテナ基板 10を保護するために、所定の絶縁材料からな るオーバーコート材によって被覆されるのが望まし 、。  [0033] On the surface of such a base film 11, an air core coil body 12 serving as a radiation electrode is exposed and formed. Specifically, in the antenna substrate 10, a spiral air core coil portion 12 wound around each side of the base film 11 is formed on the surface of the base film 11. The end portion on the innermost peripheral side in the spiral air-core coil portion 12 and the end portion on the outermost peripheral side in the air-core coil portion 12 are each a connecting portion formed in a part of the base film 11. It is electrically connected to signal lines 13a and 13b provided at 1 la. The antenna substrate 10 is electrically connected to an external IC chip (not shown) via the covered signal lines 13a and 13b. The IC chip includes, for example, an antenna such as a tuning and smoothing capacitor, a diode bridge, a CPU (Central Processing Unit), a ROM (Read Only Memory), and an array (Electrically Erasable Programmable Read Only Memory). Various members for realizing the module function are integrated into a single semiconductor chip. Further, the base film 11 may be provided with through holes for electrically connecting the front and back surfaces. Furthermore, it is desirable that the front and back surfaces of the base film 11 are covered with an overcoat material made of a predetermined insulating material in order to protect the antenna substrate 10.
[0034] 一方、磁芯部材 20は、図 2に示すように、複数の平板状のフェライト焼結体 21を敷 き詰めた磁性シートとして構成される。フェライト焼結体 21は、それぞれ、アンテナ基 板 10における空芯コイル部 12とその周辺を覆うように敷き詰められた状態で配設さ れる。例えば、フェライト焼結体 21は、同図に示すように、その主面が正方形状であ る場合には、碁盤目状に敷き詰められた状態で配設される。なお、フェライト焼結体 2 1は、当該磁芯部材 20の厚み方向に複数積層した積層体としてもよい。力かるフェラ イト焼結体 21は、外部力も与えられる磁界が微弱であっても強く磁ィ匕する性質を有 することから、空芯コイル部 12の周囲に金属物が存在したとしても、当該金属物に磁 界が漏れることなく吸収することができる。 On the other hand, the magnetic core member 20 is configured as a magnetic sheet in which a plurality of flat ferrite sintered bodies 21 are spread as shown in FIG. The ferrite sintered bodies 21 are arranged in a state where they are laid down so as to cover the air-core coil portion 12 and the periphery thereof in the antenna substrate 10. For example, as shown in the figure, the ferrite sintered body 21 is arranged in a grid pattern when its main surface is square. The ferrite sintered body 21 may be a laminated body in which a plurality of the magnetic core members 20 are laminated in the thickness direction. The powerful sintered ferrite 21 has the property of strongly magnetizing even if the magnetic field to which external force is applied is weak. Therefore, even if a metal object exists around the air-core coil portion 12, it can be absorbed without leakage of the magnetic field into the metal object.
[0035] ここで、個々のフェライト焼結体 21の大きさは、後に詳述するが、本願出願人が鋭 意行った研究によって規定されたものとされる。また、フェライト焼結体 21の主面は、 その形状に限定されるものではなぐ例えば、多角形、楕円形、円形等、規定された 大きさの条件を満たすものであれば、任意の形状とすることができる。なお、磁芯部 材 20においては、廃材を少なくするとともに薄型化の要求に対応する観点から、フエ ライト焼結体 21を同一平面内で間隙が生じないように充填して敷き詰めるのが望まし いが、当該フ ライト焼結体 21の主面形状が楕円形や円形等の場合には、同一平 面内に敷き詰めようとすると間隙が生じてしまう。この場合、磁芯部材 20においては、 間隙が生じないようにフェライト焼結体 21を段違いに積層したり、同一平面内に敷き 詰めた複数のフェライト焼結体 21の間隙に所定の磁性粉が混入されたバインダを添 カロしたりすればよい。また、複数のフェライト焼結体 21を互いに接合する接合剤とし ては、両面テープや、シリコン系接着剤や紫外線硬化接着剤等の接着剤を用いるこ とができる。また、磁芯部材 20においては、フェライト焼結体 21を配設した状態で所 定の封止剤を用いて封止してもよい。なお、接合剤としては、電磁波の透過損失が 少ない材料力 なるものを用いるのが望ましぐ具体的には、比誘電率が 500未満の 低誘電体力もなるものを用いるのが望まし 、。  Here, although the size of each ferrite sintered body 21 will be described in detail later, it is assumed that the size is defined by research conducted by the applicant of the present application. Further, the main surface of the sintered ferrite body 21 is not limited to the shape, for example, a polygon, an ellipse, a circle, etc. can do. In addition, in the magnetic core member 20, it is desirable to fill and spread the ferrite sintered body 21 so as not to generate a gap in the same plane from the viewpoint of reducing the amount of waste material and responding to the demand for thinning. However, if the main surface shape of the sintered sintered body 21 is an ellipse or a circle, a gap will be generated when trying to spread the same in the same plane. In this case, in the magnetic core member 20, the ferrite sintered bodies 21 are laminated in steps so that no gap is generated, or predetermined magnetic powder is placed in the gaps between the plurality of ferrite sintered bodies 21 laid in the same plane. Just add the mixed binder. In addition, as a bonding agent for bonding the plurality of ferrite sintered bodies 21 to each other, a double-sided tape, an adhesive such as a silicon-based adhesive or an ultraviolet curing adhesive can be used. Further, the magnetic core member 20 may be sealed with a predetermined sealant in a state where the ferrite sintered body 21 is disposed. As a bonding agent, it is desirable to use a material having a material strength with low transmission loss of electromagnetic waves. Specifically, it is desirable to use a material having a relative dielectric constant of less than 500 and a low dielectric strength.
[0036] このようなフェライト焼結体 21は、いわゆるグリーンシートの状態で切断され、焼成さ れるが、厚さが薄いために焼成時に湾曲したりすることがある。かかる湾曲は、当該フ エライト焼結体 21を積層する際にその層間に生じる間隙が大きくなる事態を招来する とともに、アンテナモジュール全体の厚さが厚くなる事態を招来するために望ましくな い。また、かかる湾曲は、通信特性を劣化させるという問題も誘発する。そのため、フ エライト焼結体 21の湾曲は、当該フェライト焼結体 21の厚さの半分以下となるように するのが望ましぐ具体的には、当該フ ライト焼結体 21の厚さの 20%以下となるよう にするのがより望ましい。ただし、フェライト焼結体 21の主面の大きさは、後述するよう に、所定の条件を満たすものとすることにより、所定値よりも小さくなる。そのため、ダリ ーンシートの状態で力かる大きさに切断されて焼成されたフェライト焼結体 21は、湾 曲しにくいものとなる。 [0036] Such a ferrite sintered body 21 is cut and fired in a so-called green sheet state, but may be curved during firing due to its thin thickness. Such a curvature is undesirable because it causes a situation in which a gap generated between the ferrite sintered bodies 21 is increased and a thickness of the entire antenna module increases. Such bending also induces a problem of deteriorating communication characteristics. Therefore, it is desirable that the curvature of the ferrite sintered body 21 be less than half the thickness of the ferrite sintered body 21. Specifically, the thickness of the ferrite sintered body 21 It is more desirable to keep it below 20%. However, the size of the main surface of the ferrite sintered body 21 becomes smaller than a predetermined value by satisfying a predetermined condition as described later. For this reason, the sintered ferrite body 21 cut and fired into a large size in the state of a green sheet is a bay. It becomes difficult to tune.
[0037] このようなアンテナ基板 10及び磁芯部材 20を備えるアンテナモジュールは、後述 するように、例えば、非接触型の商品識別用タグとして用いられたり、通信機器にお ける通信ユニットの一部として組み込まれたりする。  [0037] As will be described later, the antenna module including the antenna substrate 10 and the magnetic core member 20 is used as, for example, a non-contact type product identification tag or a part of a communication unit in a communication device. Or be incorporated as
[0038] さて、このようなアンテナモジュールにおいて、フェライト焼結体 21は、上述したよう に、所定の大きさに形成される。すなわち、フェライト焼結体 12は、その厚さを D [ m]とし、主面の面積を A[mm2]とし、長軸の長さを LI [mm]とし、短軸の長さを L2[ mm]としたとき、 In such an antenna module, the ferrite sintered body 21 is formed in a predetermined size as described above. That is, the ferrite sintered body 12 has a thickness of D [m], a major surface area of A [mm 2 ], a major axis length of LI [mm], and a minor axis length of L2 [mm]
2< D/A、且つ、 0<Ll < 5 X 21/2、且つ、 1≤L1/L2≤2 2 <D / A and 0 <Ll <5 X 2 1/2 and 1≤L1 / L2≤2
の条件を満たす大きさに形成される。なお、長軸の長さとは、フェライト焼結体 21の 主面を画定する直線部分のうち最長部分の長さを意味する。また、短軸の長さとは、 フェライト焼結体 21の主面が多角形の場合には、任意の 2つの頂点を結ぶ直線部分 であって長軸と交わる部分のうち最短部分の長さを意味する。具体的には、フ ライト 焼結体 21の主面が図 3(a)に示すような正方形である場合には、同図中 aで示す部分 が長軸となり、同図中 bで示す部分が短軸となり、 LlZL2 = 21/2= 2となる。また、 フェライト焼結体 21の主面が図 3(b)に示すような長方形である場合には、同図中 aで 示す部分が長軸となり、同図中 bで示す部分が短軸となる。さらに、フ ライト焼結体 2 1の主面が図 3(c)に示すような多角形である場合には、同図中 aで示す部分が長軸と なり、同図中 bで示す部分が短軸となる。さらに、フ ライト焼結体 21の主面が楕円形 の場合には、長軸径が長軸の長さとなり、短軸径が短軸の長さとなる。さらにまた、フ エライト焼結体 21の主面が円形の場合には、長軸及び短軸とも直径となり、 L1/L2 = 1となる。 It is formed in a size that satisfies the following conditions. The length of the long axis means the length of the longest portion of the straight portions that define the main surface of the ferrite sintered body 21. In addition, the length of the short axis is the length of the shortest portion of the portion that intersects the long axis that is a straight line connecting any two vertices when the main surface of the ferrite sintered body 21 is polygonal. means. Specifically, when the principal surface of the sintered sintered body 21 is a square as shown in Fig. 3 (a), the part indicated by a in the figure becomes the long axis, and the part indicated by b in the figure Becomes the short axis, and LlZL2 = 2 1/2 = 2. In addition, when the main surface of the ferrite sintered body 21 is a rectangle as shown in FIG. Become. Furthermore, when the main surface of the sintered sintered body 21 is a polygon as shown in Fig. 3 (c), the part indicated by a in the figure becomes the long axis, and the part indicated by b in the figure Becomes the short axis. Further, when the principal surface of the sintered sintered body 21 is elliptical, the major axis diameter is the major axis length, and the minor axis diameter is the minor axis length. Furthermore, when the main surface of the ferrite sintered body 21 is circular, the major axis and the minor axis both have diameters, and L1 / L2 = 1.
[0039] 具体的には、フェライト焼結体 21としては、その主面が正方形状のものを用いる場 合には、 1辺が 5 [mm]未満であり且つ厚さが 50[ /ζ πι]以上 550[ /ζ πι]未満であるも のを用いるのが現実的である。ここで、厚さの下限値を 50 [ m]としているのは、通 信距離の観点力もフェライト焼結体 21の磁気的特性が発揮できる限界値が 50 [ m ]であるためである。また、厚さの上限値を 550[ /ζ πι]としているのは、アンテナモジュ 一ルの薄型化の要求に対応するためである。 [0040] このようなフェライト焼結体 21を用いた磁芯部材 20を備えるアンテナモジュールは 、例えば非接触型の商品識別用タグとして用いることができる。この場合、アンテナモ ジュールに接続される ICチップには、被取付体としての当該商品に関する所定の識 別データが記録される。カゝかるアンテナモジュールを使用するにあたって当該アンテ ナモジュールは、フェライト焼結体 21側の表面に介装された感圧性接着フィルム等 を介して識別対象商品に取り付けられる。そして、アンテナモジュールは、当該商品 の物流過程及び在庫管理等の際の搬送過程で、図示しな ヽリーダ Zライタカゝら送信 された通信電波を受信するのに応じて、 ICチップに記録されている情報のうち該当 する情報を読み出し、その情報をリーダ Zライタへと送信する。 [0039] Specifically, when the ferrite sintered body 21 has a square main surface, one side is less than 5 [mm] and the thickness is 50 [/ ζ πι It is realistic to use those that are above 550 [/ ζ πι]. Here, the lower limit value of the thickness is set to 50 [m] because the limit value at which the magnetic property of the ferrite sintered body 21 can be exhibited in terms of the communication distance is 50 [m]. The upper limit of the thickness is set to 550 [/ ζ πι] in order to meet the demand for thinner antenna modules. [0040] The antenna module including the magnetic core member 20 using the ferrite sintered body 21 can be used as, for example, a non-contact type product identification tag. In this case, predetermined identification data relating to the product as an attached body is recorded on the IC chip connected to the antenna module. When using such an antenna module, the antenna module is attached to a product to be identified through a pressure-sensitive adhesive film or the like interposed on the surface of the ferrite sintered body 21 side. The antenna module is recorded on the IC chip in response to receiving communication radio waves transmitted from the reader Z writer, not shown, during the distribution process and inventory management of the product. The corresponding information is read out and sent to the reader Z writer.
[0041] このようにして商品に取り付けられたアンテナモジュールは、商品と空芯コイル部 12 との間にフェライト焼結体 21が介装されているため、当該商品の被着面が金属材で 構成されている場合であっても、インダクタンスの低下を防止することができる。これ により、このアンテナモジュールは、空芯コイル部 12によって所定の誘導電圧を発生 させることができ、この誘導電圧を ICチップへと与えることにより、リーダ Zライタによ つて確実に識別データを読み取らせることができる。  [0041] In the antenna module attached to the product in this way, since the ferrite sintered body 21 is interposed between the product and the air-core coil portion 12, the surface to be attached of the product is made of a metal material. Even if it is comprised, the fall of an inductance can be prevented. As a result, the antenna module can generate a predetermined induced voltage by the air-core coil section 12, and by applying this induced voltage to the IC chip, the reader Z writer can reliably read the identification data. be able to.
[0042] また、力かるアンテナモジュールは、被取付体としての通信機器に組み込むことも できる。なお、ここでいう通信機器としては、 ICカードや ICタグ等の IC記録媒体の読 み取りや当該 IC記録媒体に対する書き込みを行う通信ユニットを内蔵した携帯電話 機や携帯情報端末機 (Personal Digital Assistant； PDA)といった携帯無線通信端末 機が好適である。この場合、アンテナモジュールは、通信ユニットの一部として通信 機器に組み込まれる。具体的には、アンテナモジュールは、図 4に示すように、アンテ ナ基板 10、磁芯部材 20、及び金属製のシールド板 30の順に積層され、互いにその 主面を接合した状態で配設される。なお、金属製のシールド板 30は、アルミニウム、 銅、鉄、ステンレス、マグネシウム合金等力も構成され、両面テープ等を介して、アン テナ基板 10と接合する磁芯部材 20の主面とは逆の主面に接合されている。  [0042] The powerful antenna module can also be incorporated in a communication device as an attached body. The communication equipment here refers to mobile phones and personal digital assistants (personal digital assistants) that have built-in communication units that read and write to IC recording media such as IC cards and IC tags. A portable wireless communication terminal such as PDA) is suitable. In this case, the antenna module is incorporated in a communication device as a part of the communication unit. Specifically, as shown in FIG. 4, the antenna module is laminated in the order of the antenna substrate 10, the magnetic core member 20, and the metal shield plate 30, and is arranged with its main surfaces bonded to each other. The The metal shield plate 30 is also made of aluminum, copper, iron, stainless steel, magnesium alloy, etc., and is opposite to the main surface of the magnetic core member 20 joined to the antenna substrate 10 via a double-sided tape or the like. It is joined to the main surface.
[0043] このようなアンテナモジユーノレは、アンテナ基板 10, 10'上に実装された空芯コイル 部 12を覆うように複数の平板状のフェライト焼結体 21を敷き詰め、必要に応じて、所 定の接合剤を介して複数のフェライト焼結体 21を厚み方向に複数積層し、フェライト 焼結体 21に所定の金属製のシールド板 30を接合することにより、製造することがで きる。そして、アンテナモジュールは、例えば図 5に示すように、通信面となるアンテナ 基板 10とは反対側のシールド板 30の側を被着面とし、このシールド板 30側の表面 に介装された感圧性接着フィルム等を介して通信機器に形成された所定の取り付け 部 40に取り付けられる。 [0043] Such an antenna module is laid with a plurality of flat ferrite sintered bodies 21 so as to cover the air core coil portion 12 mounted on the antenna substrates 10, 10 ', and if necessary, A plurality of ferrite sintered bodies 21 are laminated in the thickness direction via a predetermined bonding agent, and ferrite It can be manufactured by joining a predetermined metal shield plate 30 to the sintered body 21. For example, as shown in FIG. 5, the antenna module has a shield plate 30 on the side opposite to the antenna substrate 10 that serves as a communication surface as an attachment surface, and is attached to the surface on the shield plate 30 side. It is attached to a predetermined attachment 40 formed on the communication device via a pressure-sensitive adhesive film.
[0044] これにより、アンテナモジュールにおいては、アンテナコイルの動作時に発生する 電波が通信機器に対して侵入するのをシールド板 30によって阻止することができ、 当該通信機器の誤作動を防止することができる。  [0044] With this, in the antenna module, the shield plate 30 can prevent radio waves generated during operation of the antenna coil from entering the communication device, thereby preventing malfunction of the communication device. it can.
[0045] ここで、取り付け部 40の周辺及び上面には、通信機器の筐体部品や配線部品等 の金属物 41が設けられているのが通常である。すなわち、アンテナモジュールは、か 力る金属物 41に包囲された状態で通信機器に組み込まれることが多い。しかしなが ら、アンテナモジュールにおいては、通信機器の取り付け部 40との間に金属物 41が 存在する場合であっても、空芯コイル部 12に向けて放射される通信電波をフェライト 焼結体 21によって吸収することができるため、金属物 41側への磁界の漏れを抑制す ることができる。したがって、アンテナモジュールにおいては、金属物 41における漏 れ磁界に起因する渦電流の発生を抑制することができ、通信特性の劣化を防止する ことができる。また、アンテナモジュールにおいては、シールド板 30を設けることにより 、通信機器の取り付け部 40における金属物 41の量や配置が異なる場合であっても、 アンテナコイルが受ける影響のノ ツキを排除することができ、安定した通信特性を 確保することが可能となる。すなわち、アンテナモジュールにおいては、シールド板 3 0を設けることにより、アンテナコイルの設置環境にかかわらず、所望の通信特性を発 揮することが可能となる。  [0045] Here, the metal part 41 such as a casing part or a wiring part of a communication device is usually provided around and on the upper surface of the attachment part 40. That is, the antenna module is often incorporated into a communication device in a state surrounded by a powerful metal object 41. However, in the antenna module, even if there is a metal object 41 between the communication device mounting portion 40, the communication radio wave radiated toward the air-core coil portion 12 is transmitted to the ferrite sintered body. Since it can be absorbed by 21, the leakage of the magnetic field to the metal object 41 side can be suppressed. Therefore, in the antenna module, generation of eddy current due to the leakage magnetic field in the metal object 41 can be suppressed, and deterioration of communication characteristics can be prevented. In addition, in the antenna module, by providing the shield plate 30, even if the amount and arrangement of the metal object 41 in the mounting part 40 of the communication device are different, it is possible to eliminate the influence of the antenna coil. And stable communication characteristics can be secured. That is, in the antenna module, by providing the shield plate 30, it becomes possible to exhibit desired communication characteristics regardless of the installation environment of the antenna coil.
[0046] [実施例] [0046] [Example]
本願出願人は、実際にアンテナモジュールを構成し、これを市販の携帯電話機 (S O506ic；ソ-一'エリクソン ·モパイルコミュニケーションズ株式会社製）に取り付けて 落下試験を行い、そのときのフェライト焼結体の状態を調べるとともに、通信特性につ いても測定した。  The applicant of the present application actually configured the antenna module, attached it to a commercially available mobile phone (S O506ic; manufactured by Soichi 'Ericsson Mopile Communications Co., Ltd.), performed a drop test, and sintered the ferrite at that time. In addition to examining the condition of the body, we also measured the communication characteristics.
[0047] 具体的には、図 6に示すように、アンテナモジュール 50を取り付けた携帯電話機 60 の当該アンテナモジュール 50が設けられている側が下側になるように当該携帯電話 機 60を垂直にした状態であって、且つ、アンテナモジュール 50が設けられていない 携帯電話機 60の上側を所定のクリップ 70を用いて固定した状態を、落下前の初期 状態とした。そして、この初期状態力も携帯電話機 60を 150cmの高さから 5回自然 落下させた後、当該携帯電話機 60を分解してアンテナモジュール 50を取り出してフ ヱライト焼結体の状態を確認し、フ ライト焼結体が割れていない場合、割れて欠落し た部分がある場合、及び割れて破損している場合の 3つの類型に分類し、評価をそ れぞれ "〇"、〃△"、〃X〃とした。なお、落下点には、コンクリート床の上層に、厚さが 2 mmであり且つ硬度が 98以上 (タイプ Dデュロメータ）の硬質プラスチックを敷設した。 また、フェライト焼結体としては、上述した条件を満たすものとして、主面が 1. 2 [mm ] X 1. 2 [mm]の正方形であり且つ厚さが 130 [ /ζ m]であるもの、主面が 3 [mm] X 3 [mm]の正方形であり且つ厚さが 300 [ m]であるもの、主面が 1. 4 [mm] X I . 4 [ mm]の正方形であり且つ厚さが 190 [ m]であるもの、主面が 2 [mm] X 2 [mm]の 正方形であり且つ厚さが 400 [ m]であるものの 4種類を用意した。また、比較例とし て用いるフェライト焼結体としては、主面が 5 [mm] X 5 [mm]の正方形であり且つ厚 さが 130 [ /ζ πι]であるもの、主面が 10 [mm] X 10 [mm]の正方形であり且つ厚さが 130 [ m]であるものの 2種類を用意した。さらに、複数のフェライト焼結体を互いに 接合する接合剤としては、両面テープ又はシリコン系接着剤を用意した。この結果を 次表 1乃至次表 3に示す。 Specifically, as shown in FIG. 6, a mobile phone 60 with an antenna module 50 attached thereto. The mobile phone 60 is in a vertical state so that the side on which the antenna module 50 is provided is the lower side, and the upper side of the mobile phone 60 on which the antenna module 50 is not provided is a predetermined clip. The state fixed using 70 was defined as the initial state before dropping. The mobile phone 60 is naturally dropped five times from a height of 150 cm, and then the mobile phone 60 is disassembled and the antenna module 50 is taken out to check the state of the fluorescent sintered body. The sintered body is classified into three types: when it is not cracked, when it is cracked and missing, and when it is cracked and damaged, and the evaluations are “〇”, “〃 △”, and “〃” respectively. At the drop point, a hard plastic with a thickness of 2 mm and a hardness of 98 or more (Type D durometer) was laid on the upper layer of the concrete floor. Assuming that the above conditions are satisfied, the main surface is a square of 1.2 [mm] X 1.2 [mm] and the thickness is 130 [/ ζ m], and the main surface is 3 [mm] X 3 [mm] square with a thickness of 300 [m], main surface 1.4 [mm] XI .4 [mm] square Four types were prepared: one with a thickness of 190 [m], one with a square of 2 [mm] x 2 [mm] and a thickness of 400 [m]. As the ferrite sintered body used, the main surface is a square of 5 [mm] X 5 [mm] and the thickness is 130 [/ ζ πι], and the main surface is 10 [mm] X 10 [mm In addition, a double-sided tape or a silicon-based adhesive was prepared as a bonding agent for bonding a plurality of sintered ferrite bodies to each other. The results are shown in the following Tables 1 to 3.
[0048] [表 1] [0048] [Table 1]
Figure imgf000015_0001
Figure imgf000015_0001
[0049] [表 2]
Figure imgf000016_0001
[0049] [Table 2]
Figure imgf000016_0001
[0050] [表 3] [0050] [Table 3]
Figure imgf000016_0002
Figure imgf000016_0002
[0051] 上表 1からわかるように、上述した条件を満たすフェライト焼結体を用いて構成され るアンテナモジュール (実施例 1乃至実施例 4)は、いずれもフェライト焼結体が割れ ることがなく、剛性が高いという結果が得られた。また、これらの実施例 1乃至実施例 4 においては、通信距離については実用上問題がな力つた。これに対して、上表 3から ゎカゝるように、上述した条件を満たさな ヽフェライト焼結体を用いて構成されるアンテ ナモジュール (比較例 1乃至比較例 4)は、いずれもフェライト焼結体が割れてしまい 、剛性が低いという結果が得られた。さらに、実施例 1で用いたフェライト焼結体を積 層した場合における通信距離の変化についても測定した結果、上表 2に示すように、 層数が増えるほど、インダクタンスが大きくなり、 Q値も大きくなることから、通信距離が 長くなるという結果が得られた。 [0051] As can be seen from Table 1 above, in any of the antenna modules (Examples 1 to 4) configured using a ferrite sintered body that satisfies the above-described conditions, the ferrite sintered body may crack. The result was that the rigidity was high. In Examples 1 to 4, there was no practical problem with respect to the communication distance. On the other hand, as shown in Table 3 above, all of the antenna modules (Comparative Examples 1 to 4) that use ferrite sintered bodies that do not satisfy the above-mentioned conditions are ferrites. As a result, the sintered body was broken and the rigidity was low. Furthermore, as a result of measuring the change in the communication distance when the ferrite sintered body used in Example 1 was stacked, as shown in Table 2 above, as the number of layers increased, the inductance increased and the Q value also increased. As a result of the increase, the communication distance was increased.
[0052] これらの結果から、アンテナモジュールにおいては、上述した条件を満たす大きさ のフェライト焼結体を用い、当該アンテナモジュールに要求される厚みを満足する範 囲でフェライト焼結体を積層することにより、剛性が高く且つ優れた通信特性を実現 することができることがわ力つた。  [0052] From these results, in the antenna module, a ferrite sintered body having a size satisfying the above-described condition is used, and the ferrite sintered body is laminated within a range satisfying the thickness required for the antenna module. As a result, we were able to realize high rigidity and excellent communication characteristics.
[0053] 以上説明したように、本発明の実施の形態として示したアンテナモジュールは、フエ ライト焼結体の大きさを規定することにより、脆弱材料であるフェライト焼結体を用いな がらも高 、剛性を実現することができ、優れた通信特性を実現することができる。  [0053] As described above, the antenna module shown as the embodiment of the present invention has a ferrite sintered body that is a brittle material by specifying the size of the ferrite sintered body. , Rigidity can be realized, and excellent communication characteristics can be realized.
[0054] なお、本発明は、上述した実施の形態に限定されるものではない。例えば、上述し た実施の形態では、アンテナモジュールが外部の ICチップと電気的に接続するタイ プであるものとして説明した力 本発明は、 ICチップをアンテナ基板に搭載するタイ プであっても適用することができる。 Note that the present invention is not limited to the above-described embodiment. For example, In the embodiments described above, the power described as the antenna module is a type that is electrically connected to an external IC chip. The present invention can also be applied to a type in which an IC chip is mounted on an antenna substrate. it can.
[0055] 具体的には、アンテナモジュールとしては、図 7(a)に平面図及び図 7(b)に側面図を 示すように、 ICチップ 15を備えるものであってもよい。すなわち、かかるアンテナモジ ユールは、磁芯部材 20との被着面となるアンテナ基板 10'を構成するベースフィルム 11の主面の一部に、例えばウレタン榭脂等力もなるコア材を配設することにより、 IC チップ搭載面を形成し、この ICチップ搭載面に搭載された ICチップ 15と、空芯コイル 部 12における両端部とを電気的に接続して構成される。このようなアンテナモジユー ルも、非接触型の商品識別用タグや通信機器における通信ユニットの用途に用いる ことができる。特に、力かるアンテナモジュールは、通信機器に組み込む場合には、 例えば図 8に示すように、アンテナ基板 10'、磁芯部材 20、及び金属製のシールド板 30の順に積層され、互いにその主面を接合した状態で配設される。そして、アンテナ モジュールは、先に図 5に示したように、通信面となるアンテナ基板 10'とは反対側の シールド板 30の側を被着面とし、このシールド板 30側の表面に介装された感圧性接 着フィルム等を介して通信機器に形成された所定の取り付け部 40に取り付けられる。 なお、 ICチップ搭載部は、アンテナ基板 10の通信面となる側に設けてもよい。ただし 、アンテナモジュールにおいては、図 7(a)及び図 7(b)に示すように、空芯コイル部 12 が形成された面の裏面に ICチップ搭載部を形成することにより、当該空芯コイル部 1 2が形成された面に ICチップ搭載部を形成する領域として十分な領域を確保すること が困難である場合であっても、 ICチップ搭載部を形成する領域を十分に確保するこ とが可能となる。また、アンテナモジュールにおいては、空芯コイル部 12の最内周領 域に ICチップ搭載部を形成する必要もなぐ空芯コイル部 12の形状等に応じて、 IC チップ搭載部を任意の位置に形成することもできる。  Specifically, the antenna module may include an IC chip 15 as shown in a plan view in FIG. 7 (a) and a side view in FIG. 7 (b). That is, in such an antenna module, a core material that also has, for example, urethane resin is provided on a part of the main surface of the base film 11 that constitutes the antenna substrate 10 ′ that is to be attached to the magnetic core member 20. Thus, an IC chip mounting surface is formed, and the IC chip 15 mounted on the IC chip mounting surface is electrically connected to both end portions of the air-core coil unit 12. Such an antenna module can also be used for a contactless product identification tag or a communication unit in a communication device. In particular, when a powerful antenna module is incorporated in a communication device, for example, as shown in FIG. 8, an antenna substrate 10 ′, a magnetic core member 20, and a metal shield plate 30 are laminated in this order, and their main surfaces are mutually stacked. Are arranged in a joined state. Then, as shown in FIG. 5, the antenna module has the shield plate 30 side opposite to the antenna substrate 10 ′ serving as the communication surface as the adherend surface, and is interposed on the shield plate 30 side surface. It is attached to a predetermined attachment part 40 formed on the communication device through the pressure-sensitive adhesive film or the like. Note that the IC chip mounting portion may be provided on the antenna substrate 10 on the communication surface side. However, in the antenna module, as shown in FIG. 7 (a) and FIG. 7 (b), by forming the IC chip mounting portion on the back surface of the surface on which the air core coil portion 12 is formed, the air core coil Even if it is difficult to secure a sufficient area for forming the IC chip mounting portion on the surface on which the portion 12 is formed, it is necessary to secure a sufficient area for forming the IC chip mounting portion. Is possible. In addition, in the antenna module, the IC chip mounting portion can be placed at an arbitrary position depending on the shape of the air core coil portion 12 that does not need to be formed in the innermost peripheral region of the air core coil portion 12. It can also be formed.
[0056] さらに、上述した実施の形態では、同じ大きさのフ ライト焼結体 21を敷き詰める場 合について説明した力 本発明は、例えば、空芯コイル部 12の周辺部分は小さいフ エライト焼結体 21を用いる一方で、その他の部分については耐衝撃性が少なくてもよ いことから大きめのフェライト焼結体 21を敷き詰める、といったように、上述した条件を 満たす大きさであれば、異なる大きさや形状のフ ライト焼結体 21を敷き詰めるように してちよい。 [0056] Furthermore, in the above-described embodiment, the force described in the case where the same size of the sintered ferrite body 21 is laid down. While the body 21 is used, the other parts have the above-mentioned conditions such that a large ferrite sintered body 21 is spread because the impact resistance may be small. If it is a size that satisfies the requirements, it is possible to spread the sintered ferrite 21 having a different size or shape.
[0057] さらにまた、上述した実施の形態では、 ICカードや ICタグとして用いられるアンテナ モジュールについて説明した力 本発明は、力かる ICカードや ICタグとしての形状に 限らず、用途に応じたその他各種の形状にも適用することが可能である。  [0057] Furthermore, in the above-described embodiment, the power described for the antenna module used as an IC card or IC tag. The present invention is not limited to the shape as a powerful IC card or IC tag, and other configurations depending on the application. It can be applied to various shapes.
[0058] このように、本発明は、その趣旨を逸脱しない範囲で適宜変更が可能であることは いうまでもない。  [0058] Thus, it goes without saying that the present invention can be modified as appropriate without departing from the spirit of the present invention.

Claims

請求の範囲 The scope of the claims
[1] 複数の平板状のフェライト焼結体を敷き詰めて形成されており、  [1] It is formed by spreading a plurality of flat ferrite sintered bodies,
上記フェライト焼結体は、その厚さを D^ m]とし、主面の面積を A [mm2]とし、長 軸の長さを LI [mm]とし、短軸の長さを L2 [mm]としたとき、 The ferrite sintered body has a thickness of D ^ m], a main surface area of A [mm 2 ], a major axis length of LI [mm], and a minor axis length of L2 [mm]. ]
2< D/A、且つ、 0<Ll < 5 X 21/2、且つ、 1≤L1/L2≤2 2 <D / A and 0 <Ll <5 X 2 1/2 and 1≤L1 / L2≤2
の条件を満たす大きさに形成されていること  The size must meet the requirements of
を特徴とする磁性シート。  Magnetic sheet characterized by
[2] 上記フェライト焼結体は、その主面の 1辺が 5mm未満であり、且つ、厚さが 50 m 以上 550 μ m未満であること [2] The ferrite sintered body has one side of its main surface of less than 5 mm and a thickness of 50 m or more and less than 550 μm.
を特徴とする請求の範囲第 1項記載の磁性シート。  The magnetic sheet according to claim 1, wherein:
[3] 複数の上記フェライト焼結体は、比誘電率が 500未満の低誘電体からなる接合剤 によって互 、に接合されて 、ること [3] The plurality of ferrite sintered bodies are bonded to each other by a bonding agent made of a low dielectric material having a relative dielectric constant of less than 500.
を特徴とする請求の範囲第 1項記載の磁性シート。  The magnetic sheet according to claim 1, wherein:
[4] 複数の上記フェライト焼結体は、同一平面内に間隙が生じないように充填して敷き 詰められていること [4] The plurality of ferrite sintered bodies are filled and spread so that no gaps are formed in the same plane.
を特徴とする請求の範囲第 1項記載の磁性シート。  The magnetic sheet according to claim 1, wherein:
[5] 複数の上記フェライト焼結体は、当該磁性シートの厚み方向に複数積層した積層 体とされること [5] The plurality of ferrite sintered bodies should be a laminated body in which a plurality of layers are laminated in the thickness direction of the magnetic sheet.
を特徴とする請求の範囲第 1項記載の磁性シート。  The magnetic sheet according to claim 1, wherein:
[6] 複数の上記フェライト焼結体は、間隙が生じないように段違いに積層されていること を特徴とする請求の範囲第 5項記載の磁性シート。 6. The magnetic sheet according to claim 5, wherein the plurality of ferrite sintered bodies are laminated in steps so as not to generate a gap.
[7] 同一平面内に敷き詰められた複数の上記フェライト焼結体の間隙に所定の磁性粉 が混入されたバインダが添加されて 、ること [7] A binder in which a predetermined magnetic powder is mixed is added to the gaps between the plurality of ferrite sintered bodies spread on the same plane.
を特徴とする請求の範囲第 1項記載の磁性シート。  The magnetic sheet according to claim 1, wherein:
[8] アンテナコイルを有するアンテナ装置であって、 [8] An antenna device having an antenna coil,
上記アンテナコイルが実装されたアンテナ基板と、上記アンテナコイルを覆うように 複数の平板状のフェライト焼結体を敷き詰めて形成された磁性シートとが、互いにそ の主面を接合した状態で配設され、 上記フェライト焼結体は、その厚さを D^ m]とし、主面の面積を A [mm2]とし、長 軸の長さを LI [mm]とし、短軸の長さを L2 [mm]としたとき、 An antenna substrate on which the antenna coil is mounted and a magnetic sheet formed by laying a plurality of flat ferrite sintered bodies so as to cover the antenna coil are arranged with their main surfaces bonded to each other. And The ferrite sintered body has a thickness of D ^ m], a main surface area of A [mm 2 ], a major axis length of LI [mm], and a minor axis length of L2 [mm]. ]
2< D/A、且つ、 0<Ll < 5 X 21/2、且つ、 1≤L1/L2≤2 2 <D / A and 0 <Ll <5 X 2 1/2 and 1≤L1 / L2≤2
の条件を満たす大きさに形成されていること  The size must meet the requirements of
を特徴とするアンテナ装置。  An antenna device characterized by the above.
[9] 上記磁性シートは、複数の上記フェライト焼結体によって上記アンテナコイルの周 囲を覆うように配設されて 、ること [9] The magnetic sheet is disposed so as to cover the periphery of the antenna coil by the plurality of ferrite sintered bodies.
を特徴とする請求の範囲第 8項記載のアンテナ装置。  The antenna device according to claim 8, wherein:
[10] 上記アンテナ基板と接合する上記磁性シートの主面とは逆の主面に、所定の金属 製のシールド板が接合されて 、ること [10] A predetermined metal shield plate is bonded to the main surface opposite to the main surface of the magnetic sheet to be bonded to the antenna substrate.
を特徴とする請求の範囲第 8項記載のアンテナ装置。  The antenna device according to claim 8, wherein:
[11] 上記アンテナコイルは、外部の ICチップと電気的に接続されること [11] The antenna coil must be electrically connected to an external IC chip.
を特徴とする請求の範囲第 8項記載のアンテナ装置。  The antenna device according to claim 8, wherein:
[12] 上記アンテナ基板には、 ICチップ搭載面が形成されており、 [12] An IC chip mounting surface is formed on the antenna substrate.
上記アンテナコイルは、上記 ICチップ搭載面に搭載された ICチップと電気的に接 続されること  The antenna coil is electrically connected to the IC chip mounted on the IC chip mounting surface.
を特徴とする請求の範囲第 8項記載のアンテナ装置。  The antenna device according to claim 8, wherein:
[13] アンテナコイルを有するアンテナ装置の製造方法であって、 [13] A method of manufacturing an antenna device having an antenna coil,
アンテナ基板上に実装された上記アンテナコイルを覆うように複数の平板状のフエ ライト焼結体を敷き詰める工程と、  Laying a plurality of flat ferrite sintered bodies so as to cover the antenna coil mounted on the antenna substrate;
所定の接合剤を介して複数の上記フェライト焼結体を厚み方向に複数積層するェ 程と、  A step of laminating a plurality of ferrite sintered bodies in the thickness direction through a predetermined bonding agent;
積層した上記フェライト焼結体に所定の金属製のシールド板を接合する工程とを備 え、  And a step of joining a predetermined metal shield plate to the laminated ferrite sintered body,
上記フェライト焼結体は、その厚さを D^ m]とし、主面の面積を A [mm2]とし、長 軸の長さを LI [mm]とし、短軸の長さを L2 [mm]としたとき、 The ferrite sintered body has a thickness of D ^ m], a main surface area of A [mm 2 ], a major axis length of LI [mm], and a minor axis length of L2 [mm]. ]
2< D/A、且つ、 0<Ll < 5 X 21/2、且つ、 1≤L1/L2≤2 2 <D / A and 0 <Ll <5 X 2 1/2 and 1≤L1 / L2≤2
の条件を満たす大きさに形成されたものであること を特徴とするアンテナ装置の製造方法。 It must be formed in a size that meets the requirements of A manufacturing method of an antenna device characterized by the above.
PCT/JP2007/058232 2006-08-07 2007-04-16 Magnetic sheet, antenna device, and method for manufacturing antenna device WO2008018211A1 (en)

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TWI506854B (en) * 2011-09-28 2015-11-01 Hon Hai Prec Ind Co Ltd Antenna and method of making the same
JP6622649B2 (en) * 2015-12-21 2019-12-18 ホシデン株式会社 Non-contact communication module
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